IBM
®    Informix
® 4GL (I4GL) provides a program debugger.
   Genero Business Development Language provides a program debugger
with a different set of commands    as I4GL, compatible with the well-known
gdb tool. This debugger can be used alone in command line    mode,
or with a graphical shell compatible with gdb, such as    
ddd:
ddd --debugger "fglrun -d myprog"